Jump to content


  • Posts

  • Joined

  • Last visited

Posts posted by v_pan

  1. problems never ends!!

    well, i download a program-spy-watch-serial data.

    i have done a communication multi and software and i wanted to saw

    what data sends-recieves.

    now, software doesn't let me communicate with multi!!!

    says , (check COM1 or the unit)


  2. i don't send any command. actually , when i press some "letter" my PC stucks.<br>that i'm a doing is to connect them and wait receive data.<br>normally, multimeter sends all time data over 232.

    thus, if i connect multi with PC i will can see data.

    either hyperterminal or VI can not see anything.

    multi and software dont have problems.

  3. i didn't make any specific code on LABVIEW.

    i open the example basic serial read and write.vi

    and just try to communicate

    i also try on hyperterminal without result.

    model of multimeter (UNI-T UT70D)

    i did as operating manual said:

    Baud rate 9600

    start bit 1 (always 0)

    stop bit 1 (always 1)

    data bits 8

    parity none


    is there anything else to check?

  4. hello ...

    i have bought a multimeter and i tried to upload values to Labview

    this multimeter has own software to read and represent values

    But i did an effort to build my own software to take and show values.

    actually , i made the simpliest communicate on RS232 without result.

    do you think that data have a codification or something?

    is there anyone who did that before?

    if you want i can upload manual of multimeter.

  5. thanks for answer Dan!!

    i send from my microcontroller 10 periods = 250 values.

    when labview takes the last value,then appears the result and wait for another

    250 values .my problem is that i don't want to run continusly

    i want to take 250 values ,calculate ,and then wait to take other 250 values.

    if i can reset tables every 250 values ???

    one thought is to add to more cases ,as example "S" for beginning and "W" at the end

    at the "S" i will do ENABLE table and at "W" i will do RESET table...

    is it possible to do this automatically???

    i hope to understand...

    3000000 is "byte to read " is very high because data are too many!

    when i put it at smaller value i have bad signals!!

  6. Hi everyone,

    I am trying to finish my project with pic and labview through serial port and i have been stucked in something and i want your help.

    I use cases to saperate three chanels that i am taking from the pic and send them from the serial port to labview. My problem is that i want the program to start making calculations when i send it one letter for example "S" (as start), S CaseA CaseB CaseC CaseA CaseB CaseC (pause_labview wait for the next start) S CaseA CaseB CaseC CaseA CaseB CaseC......somethink like this.

    Furtheremore as you can see i have to calculate the rms value of the three chanels. As you can see the value of rms is always changing but i want to see this value every 250 new values of my signal.

  7. hello ....

    i send from microcontroller via rs232 2 signals (take them from sensors)

    Volt and Current ..i can plot them and store them..

    so far so good..no problem!

    i can also estimate reactive power S=P + iQ

    the problem is how i estimate average POWER (real)

    one idea is to multiply V*I (any sample) then pass to Low Pass Filter at 5Hz

    and that i receive is real power (sounds simple!)

    i test it on simulate signals and works great


    labview don't recognize my two "signals" as signals!

    what can i do for this?

    do you have any idea?

  8. i will use a PIC microcontrolle that supports USB2.0 hardware.i will make software of USB protocal .

    so, output from PIC will be a usb cable (not rs232 to usb converter) and i 'll plug it to one of my usb2.0 port

    on my computer

    in that case, will LABVIEW recognise this PORT as serial(COM4 for example) or usb?

    can i increase speed that way?

    thanks for answer!!

  9. hello everybody..

    i made a project based on microcontroller and communicate with 232.

    my baud rate is at 115200bps and proved to be very poor for what i want to do.

    i'm thinking to change my communication to usb2.0 (microcontroller support )

    my question is ..

    if i do this ,do i have to change my program on labview?

    i mean ..

    now i select COM1 to communicate with micro

    after change this

    the only thing i have to do is to change COM1 to COM4 for example?

    and increase baud rate

    or i have to do more things on program>?

  10. i'm not so sure if i have done the right changes

    i think that i have done wrong connections :wacko:

    when it's runs the case loop (that represent A,B,C plots) is always "0"

    and i don;t see nothing plotting!

    but i noticed "read buffer" takes the right values .

    printf function from pic

    printf ("A%d\n",lut);

    printf ("B%d\n",lut1);

    printf ("C%d\n",lut2);

    what have i done wrong?

    thanks Dan DeFriese for your significantly help!!

  11. i made some changes in VI and now seems to work!

    represent and negative numbers!

    (for some reason cannot upload .bmp to see it)

    this is for one signal

    I want to use cases so as to saperate 2-3 signals.

    For example, when I sent from the serial "A30"

    the programe will recognise that the number 30

    have to store to the first file.

    When I sent "B45" the programme will store the

    number 45 to the second file etc.

    I have done a similar programe to recognise numbers,

    not srings.

    Can I do that?

    any idea?

  12. i was sending over hyperterminal that you was wrote and worked fine

    i did not putted delays and program did not confused

    i didn't maked "scan from string "work.

    i noticed that when i had labview and C code delay 10ms works fine.(and #byte read at 20)

    now another problem that generate is how represent negative numbers!

    i sent int lut[6]= {10 20 30 -20 -10 }

    for(i=1,i<=5 i++){

    printf("%d \n",lut)}


    10 20 and 30 plotted

    -20 -30 not!!

    can i fixed it on labview or can i try to fixed it on C code?

    what is your opinion?

  13. Thank you very much for your help.

    This programme works fine by now. You may notice that I made a modification to your

    programme. Instead of showing a character i made it to show a number.

    One problem that now appears is that when I am going to send some bytes every little time

    lets say every 1ms the programme confuses and it shows wrong values.

    Can you think something to solve this problem????

    What I want to do is a 12-bit ADC convert from my microcontroller and represent this bits

    as a number to a figure. Is that programme good or I have to make another one ?

  14. thank you for your answer Dan DeFriese

    i do a simple example to verify that the character

    i send from microcontroller will

    present at read buffer

    my c code is



    printf("a\n"); }

    everytime i press the button i want to see in "read buffer"

    character 'a'

    but i see differents character's everytime i press the button

    the right thing will be to see all time 'a'

    where do you think the wrong is?

    and something else

    when i increase the "bytes to read" (2,3,4....)visa error appears "blinking"

    when i have it constantly at 1 byte it's ok but visa error appears continually and does not appear the "a"

    as you can see at example

    (ps. over hyperterminal works fine)

    i hope you to understand what i mean...

    thank you...

  15. hello ...

    i'm trying to communicate from my microcontroller

    to send a simple printf() ,but i have problem's

    1. i have an error (-1073807298 ) but i don't understand what it is .I searched at the Visa error codes

    and the error says "Could not perform operation because of I/O error".

    i'm still confuse about this

    2. even with error label read buffer takes some data but it isn't the data which i send from microcontroller

    for example i send printf("abcd\n");

    and the read buffer has different value!!

    (i tried the same C code to hyperterminal and everything was fine)

    what's going wrong?

    thank you...

  16. hello everybody...

    i'm a new user of Labview,and i have to say that i found it very interesting.

    i want to ask you some questions before i start a project,if anyone can help me.

    i will communicate with a microcontroller (Pic)

    the kind of connection will be via ethernet port.

    i did not found any example to show me the way to do this.

    is it possible,this kind of communication?

    thank you ..

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.